3 level inheritance heirarchy

From:

interec@interec.net

Newsgroups:

comp.lang.c++

Date:

Fri, 21 Dec 2007 01:05:39 -0800 (PST)

Message-ID:

<746477ac-a85b-4c45-b9f1-b8f682eeb578@e23g2000prf.googlegroups.com>

I have trying to set up a three level inheritance heirarchy (see files
test.h/cpp below). When I compile this code using g++, I get the
following errors:

bash-3.00$ g++ test.cpp
test.cpp: In constructor `Lev2::Lev2(int, int, int)':
test.cpp:33: error: no matching function for call to `Lev0::Lev0(const
void**)'
test.h:27: note: candidates are: Lev0::Lev0(const Lev0&)
test.cpp:6: note: Lev0::Lev0(int)

Can someone please explain whats going on and how I can fix this
problem. Please see code below. If I remove the classes ILev2 and Lev2
everything compiles fine. Thanks

//-------------------------- FILE: test.h --------------------------//

#include <iostream>
#include <iomanip>

class ILev0
{
public:
  virtual ~ILev0() {}
  virtual void PrintLev0() = 0;
};

class ILev1: public virtual ILev0
{
public:
  virtual ~ILev1() {}
  virtual void PrintLev1() = 0;
};

class ILev2: public virtual ILev1
{
public:
  virtual ~ILev2() {}
  virtual void PrintLev2() = 0;
};

class Lev0: public virtual ILev0
{
public:
  Lev0(int nNum);
  virtual void PrintLev0();

protected:
  int m_nNum0;
};

class Lev1: public virtual Lev0, public virtual ILev1
{
public:
  Lev1(int nNum0, int nNum1);
  virtual void PrintLev1();
protected:
  int m_nNum1;
};

class Lev2: public virtual Lev1, public virtual ILev2
{
public:
  Lev2(int nNum0, int nNum1, int nNum2);
  virtual void PrintLev2();
protected:
  int m_nNum2;
};

//-------------------------- FILE: test.cpp ------------------------//
#include "test.h"

//-------

Lev0::Lev0(int nNum)
  :m_nNum0(nNum)
{
}

void Lev0::PrintLev0()
{
  std::cout << "Lev0 Num: " << m_nNum0 << std::endl;
}

//-------

Lev1::Lev1(int nNum0, int nNum1)
  :Lev0(nNum0),
   m_nNum1(nNum1)
{
}

void Lev1::PrintLev1()
{
  std::cout << "Lev1 Num: " << m_nNum0 << ", " << m_nNum1 <<
std::endl;
}

//-------

Lev2::Lev2(int nNum0, int nNum1, int nNum2)
  :Lev1(nNum0, nNum1),
   m_nNum2(nNum2)
{
}

void Lev2::PrintLev2()
{
  std::cout << "Lev2 Num: " << m_nNum0 << ", " << m_nNum1 << ", " <<
m_nNum2 << std::endl;
}

//---

main()
{
  Lev0 *b = new Lev0(10);
  b->PrintLev0();
}

//------------------------------------------------------------------//

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